Structure and performance characteristics of TIMKEN double row tapered roller bearings
Structure and performance characteristics of TIMKEN double row tapered roller bearings:
Double row tapered roller bearings have many structures. The largest quantity is 35000 type. There is a double raceway outer ring and two inner rings. There is a spacer between the two inner rings. The thickness of the spacer can be changed to adjust the clearance. These bearings are capable of withstanding biaxial axial loads while subjected to radial loads and limit axial displacement of the shaft and housing within the axial clearance of the bearing. Structural features of tapered roller bearings. The type of tapered roller bearing is 30,000, and the tapered roller bearing is a separate bearing. Tapered roller bearings are mainly used to withstand radial and axial combined loads based on radial loads. Compared with angular contact ball bearings, the bearing capacity is large and the limit speed is low. Tapered roller bearings are capable of withstanding axial loads in one direction and can limit axial displacement in one direction of the shaft or housing.
Nsk bearing as far as possible when installing the rules
When installing nsk bearings, the most important thing is to keep it clean. The mixing of dust, rust, etc. will be the biggest cause of shortening the life of the bearing. Therefore, it is necessary to observe the following precautions.
First, use a cleaning tool to work in a clean place.
Second, the tools used in the installation should use wooden or light metal products, avoiding other things that are prone to debris.
Third, the bearing can be unsealed when it is in use.
Fourth, clean your hands before work, then install nsk bearings.
Fifth, under normal circumstances, the anti-rust oil does not have to be cleaned and can be installed in the original state.
Timken spherical roller bearing fault maintenance precautions
Timken bearing fault characteristics show severe faults (usually, such as bearing damage, burns, sand cracking, raceways, beading, etc.) no more than a week old, equipment, larger capacity, faster, shorter Interval. Therefore, the actual bearing fault diagnosis, once the fault is discovered, its advanced function, should determine the fault of the spherical roller bearing decisively and repair as soon as possible.
1. Selection and control of shaft and bearing chamber tolerance: After the bearing is pressed into the timken bearing, it should be flexible and unobstructed. If the obvious rotation is not flexible, it means that the size of the shaft is too large and the tolerance is lowered. If the spherical roller bearing is pressed into the shaft and turned by hand, there is a clear "sand" feeling, which may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, it is necessary to control the roundness when controlling the tolerance of the shaft and the bearing chamber. At present, many domestic manufacturers only control the tolerance and do not control the roundness.
2, the assembly of the bearing: Because the bearing is a high-precision product, such as improper assembly can easily damage the bearing channel, resulting in bearing damage. Spherical roller bearings should have a special mold when assembling, can not be beaten at will, only a small circle of force when pressing the shaft, only a large circle when pressing the large circle. Air pressure or hydraulic pressure is required for assembly. When pressing, the upper and lower molds should be outside the horizontal state. If tilted, the timken bearing channel will be damaged due to the force, which will cause the bearing to produce a sound.
3. Prevention of assembly of foreign objects: When the bearing is mounted on the rotor to make dynamic balance, it is easy to enter the iron filings generated during dynamic balancing into the bearing. Therefore, it is better to balance the load before loading the bearing. Some manufacturers have some oil or grease to lubricate the bearing chamber during assembly. However, it is often difficult for the operator to control the amount. If the oil or grease accumulates in the bearing chamber, the roller is in the centering roller. It is easy to enter the timken bearing along the shaft as the bearing rotates. It is best not to apply oil or grease to the bearing chamber. If it is not painted, it must be controlled not to accumulate in the bearing chamber.
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INA bearing repair and maintenance considerations
Rolling INA bearings are precision components and should be used with great care. Even high quality INA bearings, if not used properly, will not achieve the desired results.
The precautions for the use of INA bearings are as follows.
Keep the INA bearing and its surroundings clean
Even tiny dust that is invisible to the naked eye can have an adverse effect on the INA bearing. Therefore, keep the area clean so that dust does not intrude into the INA bearing.
Use with care.
In the use of the INA bearing strong impact, it will produce scratches or indentations, causing accidents. In severe cases, it will cause cracks and breaks and must be taken care of.
Use INA bearing special tools.
Special tools must be used and cannot be replaced.
Avoid rusting the INA bearing.
When operating an INA bearing, hand sweat can cause rust. Be careful to use clean hands, try to wear gloves and pay attention to corrosive gases.
2. Installation
Whether the INA bearing is installed correctly or not directly affects the accuracy, life and performance of the bearing. Therefore, the design and assembly department should fully study the installation of INA bearings and follow the operating standards. The job standard items are usually as follows:
Cleaning INA bearings and related components
Check the size and accuracy of related parts
installation
INA bearing inspection after installation
Filling lubricant
I hope to open the INA bearing package again during installation. Generally, when the grease is lubricated, the bearing is not cleaned and the grease is directly filled. When lubricating oil, it is generally not necessary to clean. However, for instruments or high-speed INA bearings, clean the oil and remove the rust inhibitor applied to the INA bearing. The INA bearing with the rust preventive removed is easy to rust, so it cannot be placed at will.
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Analysis of Abnormal Phenomenon Caused by FAG Bearings
One: FAG bearing grease rheology:
1. When the grease is not subjected to external force, it can maintain a certain shape like a solid, that is, it will not automatically lose when it is at rest.
2. In the case of extremely high shear stress (high shear rate), the grease flows like a Newtonian fluid, and the viscosity can be kept constant without changing with the shear rate.
3. When subjected to weak external force, elastic deformation occurs; after removing the external force, it can return to its original position and shape, exhibiting the elastic properties of the solid.
4. When the applied external force is large enough, the grease deforms and flows, and thus can no longer automatically return to the original position and shape, so the starting torque of the grease on the mechanically moving part is larger than that of the liquid lubricating oil.
Two: FAG bearing grease defects:
1. Grease is semi-solid and does not flow at normal temperature, so it is difficult to add grease or change grease on friction parts. FAG cleaning is not very convenient.
2. The stirring resistance is large, so the heat generation is large and the cooling effect is poor. However, it should be noted here that this has a close relationship with the lubrication method. If the lubricating oil is lubricated with a fully immersed (or semi-immersed) oil bath, the grease will consume less power than the oil. For example, the British Journal of Friction and Lubrication reported in 1973, 6th issue: With a rolling FAG bearing with a diameter of 100, the speed is 1500r/min, and it is lubricated with grease. There are many examples of energy consumption in China, such as the refractory plant of Chongqing Iron and Steel Company. The motor power of the refractory tunnel kiln induced draft fan is grease compared to the N68 lubricant. The FAG bearing temperature is 4~6 °C lower.
3. The base oil is the carrier of the additive, and the additive does not function if the base oil fails.
4. Due to the mechanical action, the lubricating base filled in the FAG bearing configuration will gradually lose its lubricating properties. Therefore, the grease needs to be continuously replenished and updated. The interval between lubricant replenishment varies depending on the formation, size, and rotational speed of the FAG bearing, and the approximate interval of replenishment of the grease is required depending on the operation time.
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Maintenance, inspection, and abnormal handling of SKF bearings and damage measures
Maintenance, overhaul, and abnormal handling of SKF bearings
In order to maintain the original performance of SKF bearings in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.
Damage and countermeasures of SKF bearings
In general, if the SKF bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and cannot be used. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.
Regarding the damage state of the SKF bearing, for example, the jam of the ferrule rim of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the foreign matter intrusion, the SKF bearing installation error, the shaft If the deflection is too large, there will be coincidences of these reasons.
Therefore, it is difficult to know the true cause of the damage by only investigating the SKF bearing damage. However, if you know the use of SKF bearings, the conditions of use, the structure around SKF bearings, and understand the situation before and after the accident, combined with the damage state of SKF bearings and several reasons, it can prevent similar accidents from happening again.
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High-speed TIMKEN bearings for grease performance requirements
(1) Long service life can reduce maintenance costs and reduce friction consumption of TIMKEN bearings.
(2) Appropriate consistency, with better vibration damping function, can reduce the noise of high-speed TIMKEN bearings, and is conducive to environmental protection.
(3) The anti-oxidation performance is good. After the use time is long, the appearance color and pH of the grease change little, and there is no obvious oxidation phenomenon.
(4) The flow performance is good. Generally, the use temperature is between -25 degrees Celsius and 120 degrees Celsius. The starting torque is small, the running torque is low, the energy consumption is small, and the temperature change is small.
(5) It has strong rust prevention, salt spray resistance and good water resistance, and can be used in harsh working environments.
(6) The insulation grade is A, E, and B grades, and may not contain additives such as sulfur and chlorine.
(7) Good adaptability and high and low temperature performance.
(8) Lubricity and abrasion resistance are good, no oil, no drying, no emulsification, no loss, and the grease itself should not contain solids.
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NSK linear guide features for LIB manufacturing equipment
NSK developed the "NSK Linear GuideTM for LIB Manufacturing Equipment" and put it on the market. All metal parts of this product are free of copper and zinc, and are developed by NSK alone and contain no metal elements.
NSK linear guides are widely used in automotive manufacturing equipment, semiconductors, liquid crystal manufacturing equipment, handling robots, machine tools and other fields. NSK LIB manufacturing equipment uses linear guide rails with rechargeable battery performance. Lithium batteries are gradually replacing nickel-metal hydride batteries as one of the main development trends. In the battery manufacturing process, if metal powder is mixed into the battery, it may cause a fire accident. Therefore, in the manufacturing process, it is necessary to strictly prevent metal powder such as copper or zinc which cannot be electrolyzed in the electrolyte.
Features:
Conventional copper and galvanized parts are made of stainless steel, which prevents metal powders such as copper and zinc that cannot be electrolyzed during the manufacturing process of lithium batteries, thereby preventing fires and improving safety.
Made with clean grease (no metal)
Long-term maintenance free
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Cylinder bearing housing hole inspection and bearing matching
Bearings (tiles) must be replaced during engine overhaul. Replacing the bearing includes two stages: optional bearing and machined bearing.
1. Inspection of crankshaft bearing housing bore and matching of bearings
1. Before the bearing is matched, first check whether the bearing housing hole meets the standard. Clean the housing and cover, crankshaft and crankcase. Check whether the end face of the bearing cap is flat, and the flatness and the maximum depth of the bore should conform to the specified data.
2. As needed, place a number of gaskets (copper or steel) on both ends of the bearing cap to make the bearing seat hole cushion to a perfect circle, install the bearing cap, tighten the bolt, and measure the inner diameter of the bearing housing bore with the inner diameter gauge. And its roundness and cylindricity error. If the roundness and cylindricity error exceeds 0.05mm, the boring should be repaired according to the specified size.
3. Select the bearing according to the repair size of the crankshaft journal. The bearing thickness and its uniformity are measured by a special centimeter card. The outer diameter of the bearing should be adapted to the size of the bearing housing hole, and the thickness deviation should not exceed 0.03 mm. Tap the bearing with a metal object, such as a crisp sound, indicating that the alloy is well bonded to the bottom plate.
4. Insert the appropriate bearing into the bearing seat and cover to check whether the bearing is in close contact with the bearing seat (the degree of fit between the back of the bearing and the seat hole is not less than 85% of the contact area), whether the notch and the bearing seat are The groove of the cover is fitted, and the oil hole on the bearing is in communication with the oil passage on the seat.
5. After the bearing is in close contact with the seat hole, the edge of the two ends must be higher than the plane of the bearing seat by 0.04 to 0.06 mm, so that the fitting can be better sealed. The test method is as follows: the bearing and the bearing cover are installed, and the bolt is properly tightened until the bearing is in close contact with the base. The thickness gauge is inserted into the plane of the bearing cover, and the gap between the bearing cover and the contact surface of the cylinder seat hole is measured to 0.10. The mm thick gauge insert feels fit, and a 0.15mm thick gauge cannot be inserted as appropriate. If the clearance is too large, both ends of the bearing should be trimmed; if it is too small, a separate bearing is required.
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What is the importance of lubricating FAG bearings?
Proper and timely lubrication of FAG bearings is extremely important for the performance of FAG bearings. Because the lubricant or lubrication method is correct or not, it will greatly affect the life of the FAG bearing.
The main effects of lubrication on the performance of FAG bearings are as follows:
1. Lubricate the various parts of the FAG bearing to reduce the friction and wear of the FAG bearing;
2. The heat generated by the friction or other causes inside the FAG bearing is removed by lubrication;
3. The rolling contact surface of the FAG bearing often forms an appropriate oil film to prolong the fatigue life of the FAG bearing;
4, through the lubrication can achieve the rust and dustproof effect of the FAG bearing.
The lubrication method of FAG bearings is mainly divided into grease lubrication and oil lubrication.
Grease lubrication can be used after filling the grease for a long time without replenishing, and the structure of the sealing device is relatively simple, so it is widely used. Grease lubrication has a sealing method in which a grease is filled in a sealed FAG bearing in advance, and a filling and fat filling method in which an appropriate amount of grease is filled inside the outer casing and replenished or replaced at intervals. In addition, for machines that require multiple FAG bearings to be lubricated, a centralized grease supply method that connects the pipes to each lubrication location is also used.
In short, it is necessary to lubricate FAG bearings in time, which will increase their service life.
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NSK bearing high temperature and high speed grease performance characteristics
High-temperature high-speed NSK bearing grease: high-temperature thickener thickened synthetic oil, and added multi-effect additives, is a high-quality grease that maintains normal working conditions in high temperature environment for a long time.
Performance characteristics:
The structure is smooth, the fiber is fine, and has high cleanliness. It can suppress the abnormal sound of NSK bearing during operation and meet the long-term operation requirements of high-speed NSK bearing with DN value above 500,000.
Excellent resistance to high and low temperature, lubricity, good colloidal stability and mechanical stability.
Water resistant, resistant to water rinsing and maintaining hardness over a wide temperature range. Excellent anti-oxidation performance, good anti-wear performance, resulting in extremely long service life and 5-10 times the service life of lithium base grease.
Extremely high temperature resistance and high-speed shear resistance make it easy to handle in high temperature and high speed environments.
The operating temperature range is -40 to 230 ° C and the short time is 250 ° C.
Recommended Applications:
It is suitable for lubrication of precision NSK bearings, motor NSK bearings and miniature NSK bearings in high and low temperature environments.
Suitable for lubrication of all kinds of high speed NSK bearings, high speed long life gyro motors, high speed grinders and other high speed instruments and mechanical NSK bearings.
It is suitable for mechanical use where there is a requirement to reduce noise or the environment is extremely harsh, and it is also suitable for lubrication of high temperature parts.
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Comparison of fluid-lubricated bearings and oil-impregnated bearings
First, the connected porosity is about 20% (volume fraction), and the effective gas permeability is about 10 x 10-1. m. Under the condition of low pressure and high speed of oil-containing imported bearings, the leakage of lubricating oil is very small, and the oil film does not become very thin, so it is mainly controlled by fluid lubrication. Under such low pressure and high speed conditions. Oil-impregnated bearings have a slightly lower coefficient of friction than fluid-lubricated bearings and conventional bearings that are constantly supplied with oil. This is because the air in the cavity formed in the upper portion of the inner diameter of the bearing forms bubbles in the lubricating oil, thereby lowering the apparent viscosity of the lubricating oil.
However, under high pressure and low speed conditions, the phenomenon of lubricating oil leakage is serious, the oil film is thinned, and boundary lubrication and solid contact friction are added in the fluid lubrication area, so that the friction coefficient sharply rises. Figure 6. The critical point for this phenomenon. This critical point is 6. Compared with the critical point c in a conventional bearing, it is more biased toward the low pressure, high speed side. This is because, in the case of a conventional imported bearing, the leakage of the lubricating oil only occurs at both ends of the bearing, and for the oil-impregnated bearing, in addition to the both ends, the lubricating oil leaks through the pores of the porous body. Next, the connectivity 孑L gap is about 30% (volume fraction), and the effective gas permeability is about 100×10-1. m. Oil-bearing bearing II, the connected porosity is 1.5 times that of the oil-impregnated bearing I, and the oil content is also 1.5 times. However, the leakage of lubricating oil is related to the effective gas permeability, that is, the leakage amount of the lubricating oil of the oil bearing II is an order of magnitude higher than that of the oil bearing. That is to say, for the oil-impregnated bearing II, it is more difficult to maintain the thickness and lubrication performance of the oil film, so the critical point 6 is more biased toward the low pressure and high speed side.
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Some knowledge of bearing heating failure
Bearing consultation to form a knowledge of bearing heating failure
The bearing is a fixed part of the machine and is the main body of the machine. Its function is basically to maintain the center position of the shaft and the mechanism for controlling the movement. Bearings play a decisive role in any machine. If there are no imported bearings, the machine will not work.
Many users have reported that when using bearings, the failure of bearing heating is the most common, and this failure will also affect the life and performance of the bearing. So how is this failure formed? Below, is the knowledge that is summarized for everyone.
1. The oil level is too low and the lubricant is lost from the oil seal;
2. The grease in the bearing housing is completely filled or the oil level is too high. This can lead to excessive lubrication, high temperature or oil leakage;
3. The contact type (friction) oil seal is too dry or the spring is too tight;
4. The inner hole of the bearing box is not round; the bearing box is twisted and deformed; the bearing surface is not flat; the inner diameter of the box hole is too small;
5. The contact type (friction) oil seal is too dry or the spring is too tight.
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Daily judgment of rolling hardware bearings
It is understood that knowing it can be used, to understand the functionality of hardware tools, in order to use it. Bearings, you can look at its finish (or roughness) first, the quality is good, you don't have to talk about it. Looking further, you can hold the bearing in your hand and turn it hard to see if it rotates very smoothly and naturally, without noise.
The general 6xXXX series bearings used by nsk are really easy to use, that is, the price is more than double that of domestic ones. But its life is high, compared to most domestic bearings, one can be used for the top two. So the price is still cost-effective.
There aren't many shops selling professional bearings. You can go to the hardware store to buy them. (There are some places where you can sell auto parts, motorcycle parts, and belts.) You don't have to go to a small shop. Generally, fixed stores with such bearings will make a very eye-catching brand. When you buy, you ask them to invoice, generally do not give fakes.
I have used Harbin in domestic bearings, and it is more affordable to buy. The quality is also good. But after a long time, the noise is a little loud and needs lubrication, otherwise it should be rusted.
Singapore's bearings are of quality between nsk and domestic.
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Causes of damage to the clutch release bearing
Causes of damage to the clutch release bearing
1. Working conditions and stress of clutch release bearing
The separation bearing is subjected to axial load, impact load, and radial centrifugal force during high-speed rotation during use. Further, since the fork thrust and the reaction force of the separation lever are not in the same straight line, a torsional moment is also formed. Clutch release bearings have poor operating conditions, intermittent high-speed rotation and high-speed friction, high temperature, poor lubrication conditions, and no cooling conditions.
2. Reasons for damage to the clutch release bearing
The damage of the clutch release bearing has a lot to do with the driver's operation, maintenance and adjustment. The causes of the damage are as follows:
1) The operating temperature is too high to cause overheating
Many drivers often turn the clutch halfway when turning or decelerating, and some of the gears are placed on the clutch pedal. Some vehicles have too large free travel adjustment, which makes the clutch separation incomplete, in a semi-engaged and semi-detached state. The dry friction causes a large amount of heat transfer to the separation bearing. The bearing is heated to a certain temperature, and the butter melts or dilutes the flow, so that the temperature of the separation bearing is further increased, and when the temperature reaches a certain level, it burns out.
2) wear and tear without lubrication
The clutch release bearing is lubricated with butter. There are two ways to add the butter. For the 360111 release bearing, the rear cover of the bearing should be opened to fill the grease during maintenance or when the transmission is removed, and then the rear cover should be reinstalled. For the 788611K release bearing, it can be removed and placed in molten grease for digesting, and then taken out after cooling to achieve the purpose of lubrication. In actual work, the driver easily overlooks this, resulting in a lack of oil in the clutch release bearing. The amount of wear of the separated bearing in the case of no lubrication or less lubrication is often several to several tens of times the amount of wear after lubrication. As the wear increases, the temperature will also increase greatly, which makes it more vulnerable.
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Common quality defects in bearing parts after heat treatment
Common quality defects of bearing parts after heat treatment include: quenching microstructure overheating, underheating, quenching cracks, insufficient hardness, heat treatment deformation, surface decarburization, soft spots, etc.
Overheat
Overheating of the microstructure after quenching can be observed from the rough mouth of the bearing part. However, the exact microstructure must be observed to determine the degree of overheating. If coarse needle-shaped martensite appears in the quenched structure of GCr15 steel, it is quenched and superheated. The formation may be caused by excessive overheating of the quenching heating temperature or excessive heating and holding time; or it may be due to the serious banding of the original structure, forming a local martensite needle-like coarseness in the low carbon zone between the two zones. Local overheating caused. The retained austenite increases in the superheated structure, and the dimensional stability decreases. Due to the overheating of the quenched structure, the coarse crystal of the steel causes the toughness of the part to decrease, the impact resistance is lowered, and the life of the bearing is also lowered. Excessive heat can even cause quenching cracks.
2. Underheat
If the quenching temperature is low or the cooling is poor, the tortite structure exceeding the standard is formed in the microstructure, which is called the underheated structure, which lowers the hardness and sharply reduces the wear resistance, which affects the bearing life.
3. Quenching crack
The crack formed by the internal stress of the bearing part during the quenching and cooling process is called quenching crack. The causes of such cracks are: due to excessive heating temperature of quenching or too rapid cooling, the microstructure stress when the thermal stress and metal mass volume change is greater than the fracture strength of the steel; the original defects of the working surface (such as surface micro cracks or scratches) Trace) or steel internal defects (such as slag inclusions, severe non-metallic inclusions, white spots, shrinkage residuals, etc.) form stress concentration during quenching; severe surface decarburization and carbide segregation; insufficient tempering after quenching of parts Or not tempered in time; the cold punching stress caused by the previous process is too large, forging and folding, deep turning tool marks, sharp edges and corners of the oil groove. In short, the cause of quenching crack may be one or more of the above factors, and the existence of internal stress is the main reason for the formation of quenching cracks. The quenching crack is deep and slender, the fracture is straight, and the fractured surface has no oxidation color. It is often a longitudinal straight crack or annular crack on the bearing ring; the shape on the bearing steel ball is S-shaped, T-shaped or ring-shaped. The microstructure of the quenching crack is that there is no decarburization on both sides of the crack, and the difference is obvious with forging cracks and material cracks.
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How to prevent precision imported bearings from rusting
Corrosion occurs, which not only affects the accuracy and surface roughness, but also reduces the service life, even scrapped and cannot be used.
Bearing anti-rust work is an important task, especially the rust prevention between processes, like the bearing in the heat treatment workshop after pickling, cleaning, grinding, there are many processes. When the product is not produced by running water, it is stored in the intermediate tank once it is processed sequentially, so the bearing rings stored between the processes must be rust-proof.
The conventional anti-rust oil anti-rust method similar to rust-proof paint and the methods for preventing rust between the bearing processes are generally the following:
1. Dip in the rustproof tank
The bearing ring is immersed in an aqueous solution of 5% sodium nitrite and 0.6% sodium carbonate. The anti-rust effect is good, but many rust-proof tanks and other equipment occupy a large amount of space, and management is not convenient.
2. Dip coating of concentrated sodium nitrite solution
After washing the product, it is immersed in a solution containing 15%-20% sodium nitrite and 0.6% sodium carbonate, and then stacked. In this way, the rust-preventing period is short, generally only 7-14 days, and in the rainy season, due to the wet weather, it can only be re-treated after 2-3 days, which requires labor and money.
3. Oiling
Apply anti-rust oil like anti-rust paint like finished product. This method must be cleaned before the next step is performed, which is troublesome.
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Reasons for the overheating of the motive bearing and its treatment
1. Bearing damage. Should be replaced.
2, rolling bearing grease is too little, too much or there are impurities such as iron filings. The capacity of the bearing grease should not exceed 70% of the total volume. Those with impurities should be replaced.
3. The shaft and bearing are too tight or too loose. When it is too tight, it should be reground. If it is too loose, it should be set to the shaft.
4. The bearing and the end cap are too tight or too loose. The bearing housing is machined when it is too tight, and the steel sleeve is placed inside the end cover when it is too loose.
5. The motor ends or bearing caps are poorly assembled. Install or flatten the end cap or bearing cap stop and tighten the screws.
6. The belt is too tight or the coupling is poorly assembled. Adjust the belt tension and correct the coupling.
7, the sliding bearing lubricant is too little, there are impurities or oil ring stuck. Should be refueled, replaced with new oil, repaired or replaced oil ring
Bearing speed and friction coefficient
The speed of the bearing is mainly limited by the temperature rise caused by the frictional heat inside the bearing. When the speed exceeds a certain limit, the bearing cannot continue to rotate due to burns. The limit rotation speed of the bearing refers to a limit value that does not cause frictional heating that causes burns and can continuously rotate.
Therefore, the ultimate speed of the bearing depends on the type, size and precision of the bearing as well as the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions. The limit speeds of various types of bearings using grease lubrication and oil lubrication (oil bath lubrication) are respectively included in the bearing size table. The values indicate the standard design of the bearing under normal load conditions (C/P>=13, Fa/Fr<= 0.25 or so) The limit value of the rotation speed when rotating downward. In addition, depending on the type and grade of the lubricant, the lubricant may be superior to other properties but not suitable for high-speed rotation.
The corrected load condition of the limit speed C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the basic dynamic load C), or the axial load in the combined combined load exceeds 25% of the radial load. The following formula corrects the limit speed. Na=f1*f2*n where na: corrected limit speed, rpm f1: correction factor f2 related to load conditions: correction factor n related to combined load: limit speed under normal load conditions, rpm (refer to bearing size Table) C: Basic dynamic load rating, N{kgf} P : Equivalent dynamic load, N{kgf} Fr: Radial load, N{kgf} Fa: Axial load, N{kgf} Limit of ball bearing with seal ring Speed limit with contact seal (RS type) Ball bearings are limited by the line speed of the seal contact surface, allowing the line speed to depend on the rubber material of the seal.
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How to choose sliding bearing oil
Core Tips: 1. Light and medium load sliding bearing lubricating oil selection working temperature 10-60 °C, journal pressure 3MPa or less: spindle journal speed 9m/s, lubricating oil 40°C viscosity 5-27mm2/s, suitable
1. Selection of lubricating oil for light and medium load sliding bearing The working temperature is 10-60 °C, and the journal pressure is below 3 MPa:
Spindle journal speed > 9m / s, lubricating oil 40 ° C viscosity 5-27mm2 / s, suitable lubricants L-AN5, L-AN10, L-AN15 full loss system oil;
Spindle journal speed 9-5m/s, lubricating oil 40°C viscosity 15-50mm2/s, suitable lubricating oil L-AN15, L-AN32 total loss system oil or L-TSA46 turbine oil;
Spindle journal speed of 5-2.5m / s, lubricating oil 40 ° C viscosity 32-60mm2 / s, suitable lubricant L-AN32, L-AN46 full loss system oil or L-TSA46 turbine oil;
Spindle journal speed: 2.5-1m/s, lubricating oil 40°C viscosity 42-70mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 gasoline engine oil;
Spindle journal speed of 1-0.3m/s, lubricating oil 40°C viscosity 42-80mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 turbine oil ;
Spindle journal speed of 0.3-0.1, oil 40 °C viscosity 70-150mm2 / s, suitable lubricating oil L-AN68, L-AN100, L-AN150 full loss system oil or 30# gasoline engine oil;
Spindle journal speed <0.1m/s, oil 40°C viscosity 80-150mm2/s, suitable lubricating oil L-AN100, L-AN150 total loss system oil or 30#, 40# gasoline engine oil.
2. The working temperature of medium and heavy load sliding bearing lubricating oil is 10-60°C, the journal pressure is below 3-7.5MPa: the spindle journal speed is 2-1.2m/s, the oil 40°C viscosity is 68-100mm2/s, suitable for Lubricating oil L-AN68, L-AN100 full loss system oil or No. 20 turbine oil;
The spindle journal speed is 1.2-0.6m/s, the oil 40°C viscosity is 68-110mm2/s, and the applicable lubricating oil L-AN68, L-AN100 total loss system oil or No. 20 and No. 36 turbine oil;
The spindle journal speed is 0.6-0.3m/s, the oil 40°C viscosity is 68-150mm2/s, and the applicable lubricating oil L-AN100, L-AN150 total loss system oil or No. 30 turbine oil or N100 compressor oil;
The spindle journal speed is 0.3-0.1m/s, the oil 40°C viscosity is 100-220mm2/s, the applicable lubricating oil L-AN100, L-A150 full loss system oil or 40# turbine oil;
Spindle journal speed <0.1m / s, oil 40 ° C viscosity 100-220mm2 / s, suitable lubricant L-AN150 full loss system oil or No. 40 turbine oil.
1. Selection of lubricating oil for light and medium load sliding bearing The working temperature is 10-60 °C, and the journal pressure is below 3 MPa:
Spindle journal speed > 9m / s, lubricating oil 40 ° C viscosity 5-27mm2 / s, suitable lubricants L-AN5, L-AN10, L-AN15 full loss system oil;
Spindle journal speed 9-5m/s, lubricating oil 40°C viscosity 15-50mm2/s, suitable lubricating oil L-AN15, L-AN32 total loss system oil or L-TSA46 turbine oil;
Spindle journal speed of 5-2.5m / s, lubricating oil 40 ° C viscosity 32-60mm2 / s, suitable lubricant L-AN32, L-AN46 full loss system oil or L-TSA46 turbine oil;
Spindle journal speed: 2.5-1m/s, lubricating oil 40°C viscosity 42-70mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 gasoline engine oil;
Spindle journal speed of 1-0.3m/s, lubricating oil 40°C viscosity 42-80mm2/s, suitable lubricating oil L-AN46, L-AN68 total loss system oil or L-TSA46 turbine oil or No. 20 turbine oil ;
Spindle journal speed of 0.3-0.1, oil 40 °C viscosity 70-150mm2 / s, suitable lubricating oil L-AN68, L-AN100, L-AN150 full loss system oil or 30# gasoline engine oil;
Spindle journal speed <0.1m/s, oil 40°C viscosity 80-150mm2/s, suitable lubricating oil L-AN100, L-AN150 total loss system oil or 30#, 40# gasoline engine oil.
2. The working temperature of medium and heavy load sliding bearing lubricating oil is 10-60°C, the journal pressure is below 3-7.5MPa: the spindle journal speed is 2-1.2m/s, the oil 40°C viscosity is 68-100mm2/s, suitable for Lubricating oil L-AN68, L-AN100 full loss system oil or No. 20 turbine oil;
The spindle journal speed is 1.2-0.6m/s, the oil 40°C viscosity is 68-110mm2/s, and the applicable lubricating oil L-AN68, L-AN100 total loss system oil or No. 20 and No. 36 turbine oil;
The spindle journal speed is 0.6-0.3m/s, the oil 40°C viscosity is 68-150mm2/s, and the applicable lubricating oil L-AN100, L-AN150 total loss system oil or No. 30 turbine oil or N100 compressor oil;
The spindle journal speed is 0.3-0.1m/s, the oil 40°C viscosity is 100-220mm2/s, the applicable lubricating oil L-AN100, L-A150 full loss system oil or 40# turbine oil;
Spindle journal speed <0.1m / s, oil 40 ° C viscosity 100-220mm2 / s, suitable lubricant L-AN150 full loss system oil or No. 40 turbine oil.
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